DTC P0452:00

Fuel tank pressure sensor low input

DETECTION CONDITION

• The PCM monitors the EVAP control system fuel tank pressure sensor input signal to the PCM. The test fails when the signal average drops below a minimum allowable calibrated parameter.

Diagnostic support note

• This is a continuous monitor (CCM).

• The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• Fuel tank pressure sensor connector or terminals malfunction

• PCM connector or terminals malfunction

• Short to ground in wiring harness between the following terminals:

• Fuel tank pressure sensor terminal A—PCM terminal 2BB

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

• Fuel tank pressure sensor signal circuit and ground circuit are shorted to each other

• Open circuit in wiring harness between the following terminals:

• Fuel tank pressure sensor terminal A—PCM terminal 2BB

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

• Fuel tank pressure sensor malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

NOTE:

• Recording can be facilitated using the screen capture function of the PC.

• Record the FREEZE FRAME DATA/snapshot data on the repair order.

—

Go to the next step.

2

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

• Switch the ignition off.

• Disconnect the fuel tank pressure sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

No

Go to the next step.

4

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

No

Go to the next step.

5

• Verify that the fuel tank pressure sensor and PCM connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side) and body ground:

• Fuel tank pressure sensor terminal A

• Fuel tank pressure sensor terminal C

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Fuel tank pressure sensor terminal A—PCM terminal 2BB

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 9.

No

Go to the next step.

6

• Verify that the fuel tank pressure sensor and PCM connectors are disconnected.

• Inspect for continuity between fuel tank pressure sensor terminals C and B (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

• Fuel tank pressure sensor terminal B—PCM terminal 2AJ

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to each other.

Go to Step 9.

No

Go to the next step.

7

• Verify that the fuel tank pressure sensor and PCM connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• Fuel tank pressure sensor terminal A—PCM terminal 2BB

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Fuel tank pressure sensor terminal A—PCM terminal 2BB

• Fuel tank pressure sensor terminal C—PCM terminal 2Y

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to Step 9.

8

• Inspect the fuel tank pressure sensor.

  (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the charcoal canister, then go to the next step.

(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

9

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Perform the KOEO or KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the next step.

No

Go to the next step.

10

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.